KNOW IT ALL: Tuesday's Top 7 Stories at NBC News

September 23, 2014 6:00 PM

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1. U.S. launches airstrikes against ISIS in Syria

A military offensive early Tuesday carried out by the United States and five Arab allies is the first significant strike against ISIS in Syria. “I can confirm that U.S. military and partner nation forces are undertaking military action against (ISIS) terrorists in Syria using a mix of fighter, bombe...